Thyroglossal duct cysts are the most common congenital disorder of the pediatric neck, mostly detected before the age of 7 years, with a few diagnosed in middle and old age due to the absence of infection or slow enlargement. It is mainly due to incomplete degeneration of the thyroglossal duct at the 8th week of embryonic life, with the residual duct having an inner hole in the blind lingual foramen and an outer opening in the skin of the neck; only a single hole is an incomplete fistula and the opposite is a complete one. This duct becomes a fistula due to the ulceration of the infection to the skin, and most of them swell into cysts first. The general manifestations are: 1, thyroglossal cyst: generally no discomfort, in the chin to the sternum between the midline or oblique point, you can find the mass, the cyst has a sense of substance, the boundary is clear, with swallowing or stretching the tongue up and down. In case of concomitant infection, there can be local redness, swelling and pain. Abscess formation can have ulceration. 2, thyroglossal fistula: the external fistula is often located on the anterior midline of the neck between the subchin and the thyroid cartilage or slightly to one side. The fistula may have a discharge, and if there is secondary infection, there is pus spillage.